---
title: LockNLube Pressure Return Valve (PRV) for Cordless Grease Guns – (LNL81300-M-ANZ / LNL81300-D-ANZ / LNL81300-MK-ANZ) - Applications
description: Help
---

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10 February 2026

# LockNLube Pressure Return Valve (PRV) for Cordless Grease Guns – (LNL81300-M-ANZ / LNL81300-D-ANZ / LNL81300-MK-ANZ) - Applications

## An innovative Pressure Return Valve attachment for cordless grease guns that relieves built-up pressure in the grease hose with a twist of a knob.

<iframe height="315" src="https://www.youtube.com/embed/XZXtdCuGHLg?si=EQHAOdusl8pIoG3s" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" width="560" allowfullscreen data-mce-src="https://www.youtube.com/embed/XZXtdCuGHLg?si=EQHAOdusl8pIoG3s" data-mce-style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" data-mce-fragment="1"></iframe>

- **Purpose** 
    - Designed for use with high‑performance cordless grease guns
    - Prevents dangerous pressure buildup in grease hoses
- **Problem Addressed** 
    - Battery‑powered grease guns (e.g., Milwaukee M18) can generate over 10,000 PSI rapidly
    - Clogged or blocked Zerk fittings can cause pressure to build before grease flow is noticed
    - Excess pressure can lock the coupler onto the fitting, risking sudden grease release or equipment damage
- **How the PRV Works** 
    - Twisting the PRV knob opens a valve that routes pressurized grease back into the cartridge
    - Instantly reduces hose pressure to zero
    - Allows safe, effortless coupler removal
    - Eliminates grease spray and waste

- **Key Benefits** 
    - Improves operator safety
    - Prevents pressure‑locked couplers
    - Extends coupler and hose service life by reducing high‑pressure strain
    - Speeds up maintenance by eliminating downtime caused by stuck fittings
- **Typical Use Cases** 
    - Heavy equipment maintenance (excavators, loaders, agricultural machinery)
    - Fleet maintenance for trucks and buses
    - Any lubrication work using cordless grease guns for speed and efficiency
- **Installation** 
    - Installs inline between the grease gun outlet and the hose
    - Remains in place during normal operation
    - Activated only when pressure relief is needed
- **Model Compatibility** 
    - **LNL81300‑M**: Fits Milwaukee M12™ and M18™ grease guns; also compatible with Ryobi 18V
  
  <iframe height="144.64" src="https://www.youtube.com/embed/YykNSOPEtrU?feature=oembed" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" width="256" allowfullscreen data-mce-src="https://www.youtube.com/embed/YykNSOPEtrU?feature=oembed" data-mce-style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" data-mce-fragment="1"></iframe>

     
    - **LNL81300-D-ANZ**: For DeWalt 20V grease guns
    
  
  <iframe height="315" src="https://www.youtube.com/embed/2tcL71SSrdU?si=KFQM1QJLGcyaYroT" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" width="560" allowfullscreen data-mce-src="https://www.youtube.com/embed/2tcL71SSrdU?si=KFQM1QJLGcyaYroT" data-mce-style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: none;" data-mce-fragment="1"></iframe>

    - **LNL81300-MK-ANZ**: For Makita® 18V LXT®  
      Lithium-Ion Grease Gun (XPG01)

- - All versions operate identically, differing only by thread interface
- **Summary** 
    - Ideal for scenarios involving grease back‑pressure
    - Enhances safety, convenience, and reliability for mechanics, technicians, and farmers
- **Additional Reference** 
    - LockNLube YouTube video: *“Pressure Return Valve Introduction”* demonstrating pressure relief on a cordless grease gun

- [Product Applications](https://kb.macnaughtgroup.com/product-applications?hsLang=en-au#main-content)

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